doc abbreviation

Fix PHP Notices: Reduce error log noise

While DokuWiki suppresses PHP Notices they are still a code smell and
should be fixed. This fixes some PHP Notices that occurred.

Some of these fixes could b

Fix PHP Notices: Reduce error log noise

While DokuWiki suppresses PHP Notices they are still a code smell and
should be fixed. This fixes some PHP Notices that occurred.

Some of these fixes could be refactored into nicer code once we move to
PHP 7 and get access to the `??` operator.

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Create valid empty options

The HTML-spec[0] specifies:

> If the element has no label attribute and is not a child of a datalist element: Text that is not inter-element whitespace.

So a non-breakin

Create valid empty options

The HTML-spec[0] specifies:

> If the element has no label attribute and is not a child of a datalist element: Text that is not inter-element whitespace.

So a non-breaking space is valid solution.

[0] https://html.spec.whatwg.org/multipage/form-elements.html#the-option-element

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cleaning

fix tests on windows

doc fix

translation update

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Update html.php

$regex initialization added to clearify that it is passed by reference and filled from subroutines

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hidden pages should not be indexed by search engines

When a page is marked as hidden (through the hidepages option) it should
not be indexed by search engines.

translation update

translation update

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make Mailer use mail_isvalid()

the new version of the validator is static. But it makes sense to use a
single point of entry anyway, so instead of adjusting the use of the new
class, prefer the func

make Mailer use mail_isvalid()

the new version of the validator is static. But it makes sense to use a
single point of entry anyway, so instead of adjusting the use of the new
class, prefer the function.

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moved EmailAdressValidator to composer install #1970

make use of the new classes in tpl_get_action()

This function is now deprecated.

Tests even surfaced some smaller bugs :-)